Modbus, Communication, Gf-114 – AERCO Modbus Communications Manual User Manual
Page 36
GF-114
MODBUS
Communication
Chapter 2
OMM-0035_0C
USER MANUAL
Standard Register Assignments
Page
36 of 200 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph.: 800-526-0288 05/18/12
2.4 ACS CONTROLLER (ONLY) STANDARD REGISTER
ASSIGNMENTS
IMPORTANT!
All Modbus addresses specified in the following tables are written
generically in hexadecimal format. However, many Building
Automation Systems utilize another form of addressing where: 40001
is added to the generic address for a Holding Register address.
And
30001 is added to the generic address for an Input Register address.
Be sure to check the addressing scheme being used by the BAS that
is being interfaced to the ACS.
2.4.1 ACS Controller Standard Input Register Assignments
The Read Only Input Register assignments for the ACS are listed in Table 2-4 which follows:
Table 2-4: ACS Standard Input Register Address Mapping
Modbus Data
Address
Decimal (Hex)
Menu Item
Units and Range
Default/
Comments
0 (0x0000)
(Reserved)
1 (0x0001)
Header Temperature
40 to 220°F
2 (0x0002)
Outside Air Temperature
-60 to 120°F
3 (0x0003)
Indoor Air/Return Temperature
40 to 220°F
4 (0x0004)
Fire Rate Out
0 to 100% (out to boilers)
5 (0x0005)
Header Set Temperature
40 to 220°F
6 (0x0006)
Network Address
128 to 247
Default = 128
7 (0x0007)
Total Boilers Fired
0 to 32 (for ACS)
8 (0x0008)
Total Boilers On Line
0 to 32
9 (0x0009)
(Reserved)
10 (0x000A)
Fault/Message Code
0 to 65535
Bit:
0 = Outside Air Sensor
1 = Header Sensor Error
2 = Interlock 1 Error
3 = Interlock 2 Error
4 = Indoor Air Sensor Error/
Return Sensor Error
5 = 4-20mA Input Error
11 (0x000B)
thru
15 (0x000F)
(Reserved)
16 (0x0010)
Lead Boiler Number
1 to 32